using System;

using System.Collections;

​

namespace AbstractionProgram{

    abstract class CollatzNumber

    {

        public abstract void method(int x);

    }

​

    class ColNum : CollatzNumber

    {

        public override void method(int x)

        {

            int counter = 0;

            int number = x;

            ArrayList arr = new ArrayList();

            while (x != 1)

            {

                if (x % 2 == 0)

                {

                    x /= 2;

                    arr.Add(x);

                }

                else

                {

                    x = x * 3 + 1;

                    arr.Add(x);

                }

                counter++;

            }

​

            Console.Write("the collatz sequence for" + " " + number + " " + "is" + " " + number + " ");

            for (int i = 0; i < counter; i++)

            {

                Console.Write(arr[i] + " ");

            }

        }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            Console.WriteLine("Collatz Number Program");

            ColNum collnum = new ColNum();

            Console.Write("Enter Number: ");

            int number = Convert.ToInt32(Console.ReadLine());

            collnum.method(number);

        }

    }

}